In particular, if \(b = 2a\)  (as used in [1]}), then \({\mathcal {T}}_{\epsilon } = O(\epsilon ^{-2/{a\wedge (1-a)}})\) .
In this case, the best complexity is achieved by \(a = 1/2\)  and we have \({\mathcal {T}}_{\epsilon } = O(\epsilon ^{-4})\) .
